Means for securing cutters to tools



May 13 1969 l J. s. WELLS 3,443,480

' MEANS FOR SECURING CUT-'Mms Tuo TooLs Fi lved May. 24 1967 nizw/mamma www United States Patent O 3,443,480 MEANS FOR SECURING CUITERS TO TOOLS .loe S. Wells, P.0. BOX 3114, Colorado Springs, Colo. 80907 Filed May 24, 1967, Ser. No. 641,036 Int. Cl. B23c 1/20; B23b 51/10; B23d 77/04 U.S. Cl. 90 12.5 10 Claims ABSTRACT F THE DISCLOSURE The tool is for the purpose of narrowing valve seats in internal combustion engines. During the valve seat narrowing operation it is often necessary to adjust or remove some cutters without disturbing others in the tool. The tool has a cylindrical body, the peripheral surface of which is transversely slotted to slidably receive cutters, which are longitudinally grooved in their upper surfaces, and each cutter slot is intersected by an axial bore in which is slidably received a pin-like locking member engageable with the cutter slot, some of the locking members being secured to a ring member mounted on an end of the tool ybody for movement axially thereof, and others being independent pins extending through the ring member, and means threadably mounted on the tool for holding the ring member and the independent pins in locking position independently of each other. To permit mounting the tool on pilots of different diameters, the tool is centrally apertured and coil springs of sufficient diameter and wire thickness to fully occupy the annular space between the aperture and pilot are removably retained in the aperture.

BACKGROUND OF THE INVENTION The invention relates to cutting tools and consists particularly in a valve seat narrowing tool having improved means for securing cutters to it.

In prior tools of this type, the cutters were secured to the tool by cap screws. The cap screws project a substantial distance from the peripheral surface of the tool and thus might be in the way and are diflicult to tighten in the close quarters in which the tool sometimes must operate. The cap screws become grooved from pressure against the sides of the cutters, rendering it almost mpossible to lock the cutter in its proper position in the tool, because the cutter moves as a grooved cap screw is tightened. Attempts to correct this condition by placing washers under the cap screw heads cause further unde-l sirable protrusion of the cap screws.

SUMMARY OF THE INVENTION The invention comprises a rotatable cutting tool in which the periphery of the tool body is transversely slotted to mount a plurality of elongated cutters, characterized by the provision of separate axial bores in the body intersecting each cutter slot, pins slidable in said bores and projecting into said slots for locking engagement with said cutters, and means on the end of the tool remote from the cutting end for locking and releasing some of said pins independent of the others whereby to permit individual adjustment, insertion and removal of some of said cutters without disturbing the others.

The foregoing and additional more detailed objects and advantages will be evident from the following description and the accompanying drawings, in which:

FIG. 1 is a side elevational view of a tool embodying the invention, taken from line 1 1 of FIG 2.

FIG. 2 is an enlarged top view of the tool, taken from line 2 2 of FIG. l.

FIGS. 3 and 4 are vertical sectional views taken along lines 3 3 and 4 4 respectively of FIG. 2.

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FIG. 5 is a top view of the locking ring, taken along line 5 5 of FIGS 3 and 4.

FIG. 6 is a side elevational View of the ring illustrated n FIG. 5.

FIG. 7 is a horizontal sectional view along line 7 7 of FIGS. 3 and 4.

FIGS. 8 and 9 illustrate cutters 13 and 17 respectively.

The tool comprises a cylindrical body 1, centrally cylindrically apertured at 3 for mounting on the pilot P of a hard seat grinder, and formed with an upward extension 5 of substantially less diameter than the tool body. Aperture 3 extends through extension 5 which is externally threaded.

The cylindrical surface of body 1 is formed with rectangular cross section slots 7, 9, 11 inclined in different directions with respect to its transverse planes, preferably about 7, 60 and 70 to receive different types of cutters, for example 13 and 17, for use on internal combustion engine valve seats.

In order to permit selective locking and release of cutters in the three slots without the use of cap screws as in conventional tools of this type, the tool is formed with three small diameter bores 19, 21, 23 parallel to the axis of the tool and spaced radially inwardly from its peripheral surface a distance substantially less than the depth of the slots, each of which one of the bores intersects.

Each of the cutters is of suitable rectangular cross section for slidable mounting in the slots and is formed, along its normally upwardly facing side, with an elongated groove 25, spaced from the inner side of the cutter the same distance as bores 19, 21, 23 are from the inner surfaces of the slots.

For holding cutters in slots 9 and 11, a ring 27 is formed with a pair of elongated pin-like projections 29, 29 extending at right angles from one surface of ring 27 and circumferentially and radially spaced the same as bores 21 and 23 so that, when ring 27 is positioned about tool extension S and in proximity with body shoulder 6, pin-like projections 29 will be slidably received in bores 21 and 23, with their lower ends projecting into slots 9 and 11.

For locking cutters in slot 7 independently of those in slots 9 and 11, ring 27 is formed with a hole 31 aligned with body bore 19 and a pin 33 slightly longer thanthe combined lengths of bore 19 and hole 27 is slidably received in these aligned openings with its lower end projectable into slot 7 for locking engagement with groove 25 of the cutter therein.

For releasably holding ring 27 and its projections 29 in cutter locking position on the tool, a sleeve 35 internally threaded at 37 and externally threaded at 39 is threadably mounted on tool extension 5, with its lower rim in abutting engagement with ring 27. Sleeve 35 is formed with a wide radially extending ange 41, with its rim 43 knurled to facilitate tightening sleeve 35 against ring 27 or spacing sleeve 35 from ring 27 to permit movernent of the latter away from tool body shoulder 6 and consequent retraction of ring projections 29 from cutter slots 9 and 11.

The outer threaded surface 39 of sleeve 35 is spaced radially inwardly of the tool from the projecting upper end of cutter locking pin 33 and thus exerts no control on pin 33.

For releasably holding pin 33 in cutter locking position, i.e., with its end projecting into cutter slot 7 and engaging groove 25 in the cutter therein, a circular plate-like nut 45 is threadably mounted on the threaded exterior 39 of sleeve 35. The bottom surface of nut 45 is abuttingly engageable with the end of pin 33 projecting upwardly through hole 31 in ring 27, so that pin 33 can be forced into and retained in locking engagement with a cutter in slot 7.

From the foregoing it will be evident that by retaining round nut 45 stationary with respect to the body of the tool and rotating sleeve 35 in the upward direction, the pressure of the latter on ring 27 is relieved, permitting its upward movement to retract its projections 29, 29 from cutter slots 9 and 11, thereby releasing the cutters in these slots, without affecting the locking position of pin 33.

Conversely, the cutter in slot 7 can be released without releasing those in slots 9 and 11 by retaining sleeve 35 stationary on tool extension with the lower rim of sleeve 35 pressing against ring 27 and thus holding ring projections 29, 29 in their locking positions projecting into slots 9 and 11 and engaging the grooves 25 in the cutters therein, and manually rotating round nut 45 in the upward direction about sleeve 35 until nut 45 clears the upper end of pin 33 a sufficient distance to permit the lower end of the pin to free the cutter in slot 7.

For rotatably journaling the tool on the pilot, a coil spring 46 having an outside diameter of suliicient size to snugly fit in central aperture 3 and an inside diameter of suicient size to rotatably receive the pilot, is mounted in aperture 3. To retain spring 46 in aperture 3, the bottom end of the latter is slightly narrowed by an inwardly directed annular flange 47, and a hexagonal cap 49 having through its lower portion an internally threaded axial opening 51 is threadably engageable with the upper end of tool extension 5 and has a smaller diameter smoothwalled opening 53 in its upper portion, the latter opening being of less diameter than the diameter of tool aperture 3, whereby to form a shoulder 55 engageable with the upper rim of tool extension 5 and the upper end of spring 46. To permit mounting the tool on arbors of different diameters, springs having the same outside diameter, but different inside diameters, corresponding to the arbor size, can be inserted in central aperture 3, removal and insertion of springs being facilitated by unscrewing caps Shoulder 55 also limits the amount of clockwise rotation of cap 49 with respect to the tool, so that further rotation of the cap can be used to rotate the entire tool about the pilot in the seat narrowing operation, The tool is rotated manually by means of a socket Wrench W applied to hexagonal cap 49.

Details of the tool disclosed herein may be varied substantially without departing from the spirit of the invention, and the exclusive use of those modifications as come within the scope of the appended claims is contemplated.

What is claimed is:

1. An elongated cutting tool having a plurality of transverse slots in its longitudinal surface for the receipt therein of elongated cutters, characterized by a plurality of bores extending lengthwise of the tool and each intersecting one of said slots, elongated members slidably positioned in each of said bores and projecting into the slot intersected thereby for locking engagement with the cutter therein, and means on the end of the tool remote from the cutting end for selectively locking and releasing some of said elongated members in and from their cutter engaging positions independent of the others whereby to permit individual adjustment, insertion, and removal of some of the cutters without disturbing the others.

2. An elongated cutting tool according to claim 1 wherein the end of said tool remote from the cutting end is formed with an externally threaded cylindrical extension of smaller diameter than the tool, and a member centrally apertured to receive said extension, one of said elongated members being secured to said centrally apertured member, and another of said elongated members movably extending through said centrally apertured member and protruding therefrom, said locking and releasing means comprising a sleeve threadably mounted on said extension and having a rim engageable with said centrally apertured member, and a nut threadably mounted on said sleeve and having a transverse surface engageable with the protruding end of said other elongated member.

3. An elongated cutting tool according to claim 2 including an elongated cylindrical aperture through the tool and said extension for mounting the tool on a pilot.

4. An elongated cutting tool according to claim 3 including a nut-like cap on said extension having means limiting its rotation thereon in one direction whereby to permit rotation of the toolin that direction by a wrench applied to said nut.

5. An elongated cutting tool according to claim 1 including elongated cutters for mounting in said slots, each of said cutters having a longitudinal groove in one of its longitudinal surfaces for grippingly receiving one of said elongated members.

6. An elongated cutting tool according to claim 4 wherein the diameter of said tool aperture at the cutting end of the tool is reduced to form an annular inwardly extending flange, and said nut-like cap has an aperture coaxial with said tool aperture ybut of similarly reduced diameter to form an annular inwardly extending shoulder at the other end of the tool, there being a coil spring positioned in the aperture between said flange and said shoulder with its outer surface fitting against the inner surface of the tool aperture and its inner surface adapted to closely surround the pilot and form a bearing for the tool thereon.

7. An elongated cutting tool according to claim 2 wherein said tool is cylindrical with said extension coaxial, and said centrally apertured member is a ring formed with a hole parallel with its axis for permitting the passage therethrough of said other elongated member.

8. An elongated cutting tool according to claim 7 wherein there are a pair of said one elongated members spaced apart circumferentially of said tool secured to said ring, the hole in said ring being spaced circumferentially thereof from both said one elongated members.

9. An elongated cutting tool according to claim 8 wherein there are three of said transverse slots in the cylindrical surface of the tool each inclined at a different angle, said other elongated member intersecting the slot of intremediate inclination and said one elongated members intersecting respectively the slots of minimum and maximum inclination.

10. An elongated cutting tool according to claim 2 wherein said sleeve is formed with a radially outwardly extending flange on its end portion remote from said centrally apertured member.

References Cited UNITED STATES PATENTS 1,214,138 1/1917 Critz 90-l2.5 1,469,945 10/1923 Morsdol 90-l2.5 2,376,446 5/1945 Morris 90-12.5

ANDREW R. JUHASZ, Primary Examiner.

G. WEIDENFELD, Assistant Examiner.

Us. c1. X.R. 7 7-735; 29-105 

